Core box



CORE BOX 2 Sheets-Sheet l Filed June 22,

,Mn p n f E Mw if@ m@ l i M M ./V n

Jan. 3, 1933.

M. l.. HoLLowAY ET AL GORE BOX `Filed ,June 22, 1932 2 Sheets-Sheet 2nvenlor y W wf. mim o a d@ ZB Patented `lan. 3, 1933 lUNITI-:D STATESMYNARD L. HoLLoWAY, or 'LA PORTE,

AND CLYDE sTnrHENsoN, or HANNA,

INDIANA CORE BOX Application led V.Tune 22,

Our invention relates to improvements in core boxes'and the like, andparticularly to an improved core box particularly adapted for castinginternal combustion engine pistons. A

' It is an important object of our invention to provide an improved andnovel core box of this type, which is readily assembled and disassembledbefore and after casting therewith, 1o and which is very efficientanddependable in use.

It is also an important object of our invention to provide a core box ofthe type described above which will cast apiston having a lighter weightdue to the thinner wall made possible, and which will radiate a greateramount of heat than ordinary pistons because of the peculiarconstruction thereof. y

Otherobjects and advantages of our inven 2o tion, will be understoodfrom a reading of the following description in connection with thedrawings, wherein for purposes of illustration we have shown a preferredembodiment of our invention.

. In the drawings Figure 1 is a general side elevational view of theembodiment. Y

Figure 2 is a horizontal sectional view taken approximately on the line2-2 of Fig- ,30 ure 1 loolrino' downwardl i o y Figure 3 is a sectionalelevational view of the inside of one of the core box sections.

Figure 4 is a horizontal sectional view taken approximately on the line4 4 of Figure 3 looking downwardly.

Figure 5 is a plan view of the bottom of the head of the box. y Y

Fig. 6 is a perspective view of a detail of the construction. Y

Referring in detail to the drawings, the numeral 5V generally designatesthe core box which is composed of the sectional body portion 6, the ring7 and the cap 8.

The body portion 6 is composed of twoor ,45 more sections, such as thesection A and the section B. Each of the sectionsis semi-circularl andhas a waist 9 at thelower part thereof extending laterally andconcentrically of the semi-circular wall 10..

vOn a level with the upper end of the 1932. Serial 110.618,73.

waist 9 an interior horizontal rib 11 projects inwardly. Above this rib11 and about midway of the height of thewall 10 is another horizontalrib12. rlhe horizontal rib 12 is formed triangular in cross section, thoughthe ,cross section thereof is not limited to such formation. Spacedabove the horizontal rib 12 is a semi-annular boss 13 which is squaredand is several times wider than either the horizontal rib 11 or thehorizontal rib 12. 6o. On the top of the wall 10 on the level with theupper edge of the boss 13, the upper end of the wall is provided with aremovable semi-annulus 14 which isremovably secured thereto by anysuitable means such as screws. This semi-annulus 14 operates to confinemovable members which are to be described below.

Extending from a point slightly above the upper edge of the boss 13 andextending in 704 a vertical plane downwardly is a iin 15 of relativelysmall cross section, but which is extended Aconsiderably radiallyinwardly.

Centralized upon the horizontal rib 12 and extending outwardly from theinside of the wall 10, thatis radially inwardly of the sec` tion is acircularY enlarged wrist pin opening forming boss 16, which is joinedwith the lower end portion of the vertical fin 15. Diametricallyopposite theiin 15 is another, 80 but much narrower fin 17 which extendsto and joinsthe lower horizontal rib 11. It will be observed thatthewaist 19 is undercut as indicated at 18 to a point which is almosteven with ,the outside ofthe wall 10.

It will be observed that the section A is provided in the vertical edgesof its wall 10 with openings 19, 2O located near the lower end of theedges of the wall, to receive pins 21, 22 projecting from the samelocations on 90 the vertical edges ofthe wall 10 of the section B. Whenthe sections A and B are placed so as to form an annulus in theassembled condition` the pins 21, 22 lodge in the openings 19, 2Oaligning the sections and 95 preventing relative rotation thereof. Thelit of the pins 21, 22 is such that the sections are readily separable.

Inorder tha-tthe Vsections may be maintained in the proper assembledrelationship, loo

movable members are provided which cooperate with the cap 8 when thering is in place, to maintain all of the elements of the structure insecurely assembled condition. The arrangement provided enables thedisassembly of the entire structure by simply lifting the ring 7upwardly and then lifting the cap S from the body portion, whereupon thesections of the body portion are free to be drawn apart.

The sections A and B are each provided with circumferentially spacedslots 23 which are formed vertically through the upper edge of the wall10 downwardly to a level with the lower horizontal rib 11. As seen inFigure 3 and also in Figure 1, the lower end p'ortion of the slots 23 iscurved downwardly and outwardly extended below the level of the upperedge of the rib 11 and through the upper portion of the waist 9.

The semi-annuli 14 are provided with slots which are to be noted inFigure 1 as indicated by the numerals 24. The slots 24 are formed in thelower edge or side of the annuli 14 and register with the upper ends ofthe long vertical slots 23 in the wall 10 of the sections A and B. Itappears preferable to space theslots 23 at equal circumferentialdistances. This arrangement will bring, in the construction shown, theposition of two diametrically opposite slots at the ends of thesections. In order to take care of this, the ends of the sections areeach cut away as indicated in Figure 3. Thus, when the sections areplaced together the cut-out portions form together, the equivalent ofone of the slots 23.

At one side of each slot 23 and slightly spaced therefrom there isdisposed a pin 25 projected radially from the outside of the wall 10,which carries a pin 26 which extends therefrom into and across the slot23, whereby to maintain in the slot one of the locl'ing members 27. Eachof the locking members 27 is vprovided with a horizontal slot 28 inwhich the pin 26 is engaged in such a way that the locking member 27 isfree to slide radially and rock on the pin 26.

Each of the locking members 27 comprises a comparatively thin bar orsheet 'of metal having the generally vertically elongated portion 29which has on its lower outer edge an outward and downward curvateformation 30 which is adapted to protrude from the slot 23 in allpositions of the locking members, and act as a handle for manipulatingthe same. lt will be observed that the lower edge 31 of the lockingmember is outwardly and downwardly curved to conform with the curvatureof the bottom 32 of the slot 23. Vso that the locking member will have aclimbing action as it moves inwardly. The upper end of the vertical bodyportion 29 of each locking member is provided with an inwardly directedfinger or nose 33 which has a. curved upper edge 34, and a downward andoutward angular cam surface 35 at its radially inward end to engagecertain portions of the cap 8 for retaining the same when the lock ingmembers are maintained in the full inward position by the imposition ofthe clamping ring 7.

The cap S is a generally annular disk-like body provided on one sidewith a suitable handle formation 36 and on its other side with thepeculiar formations seen in Figure 5; To begin with, the undersurface ofthe cap 8 is provided immediately inwardly of the circumferential edgethereof with an outstanding relatively thin cupped flange 37 whichcurvedly merges with a flat floor 38. Spa'c'ed inwardly of the cuppedflange 37 is another flange 39 which is thicker than the flange 37 andis arranged concentric therewith and somewhat spaced from the centerprojection 40. The center projection 40 is appropriately tapered orconical. Radiat ing from the center point 40 to and through the flange39 is a number of ribs 41 which are circumferentially spaced accordingto the number and spacing of the circumferentially spaced slots and thefins of the body portion of the device, immediately above which and inalignment with which they are to be disposed when the cap is in place.Extending radially in alignment with each of the ribs 41 there is agroove or slot 42 which extends through the periphery of the cap, andsome distance vertically therein.

It 'will be observed that the radial ribs 41 are formed at their endswith an angular surface having an angularity opposite to that formed onthe radially inward end of the finger formations 33 of the lockingmembers 27. These oppositely angular surfaces are adapted to be engagedand to have a cam and clamping action when opposed and engaged, wherebyto securely maintain the cap in its appointed relation to the balance ofthe struc'- ture, before and during a casting operation.

It will be noticed that two of the radial ribs, namely, ribs 43 and 44,which are to be aligned with the fins 15 of the sections have downwardlyextended portions which are adapted to be aligned with the fins 15. Theends of the radial ribs 43, 44 are not undercut as are the remainingribs for cooperation with 4the finger locking members.

lVith the structure described, the assembling operation is as follows.The sections A and B are brought together, and the pins 21 and 22 seatedin the openings 19, 20, the cap 8 is placed within the annuli 14 andseated upon the upper edge of the annular boss 13. Proper centering ofthe cap is ensured by the use of an appropriate pin and holearrangement, so that quick and accurate assembly is assured. The upperends of the locking members 27 are then pushed inwardly until the fingerportions thereof engage in the un` dercuts in the radial ribs on theunderside of the cap 8 and in the radial slots 42 thereof. The ring 7 isthen 'passed about and down upon the outsides of the sections formingthe body portion of the device. This movement of the ring 7 Will operateagainst the upper outer edge portions of the locking members 27 andforce them inwardly into clamping and cam engagement with the undercutportions of the cap, whereby to bring the cap securely into forcibleengagement with the parts with Which it was engaged. The device is thenready for a casting operation.

In disassembling the same after a casting operation, the ring 7 issimply lifted from its position, so that the upper ends of the lockingmembers may fall radially outwardly out of clamping engagement With thecap 8, and then the cap 8 may be lifted, and this frees the sections Aand B so that they may be sep-- arated Without effort.

It will be observed that the formations given the piston by the interiorformations of the inner Walls of the sections, provided as they are withribs and as a result of the vertical slots, the boss 13, and thepeculiar formations of the underside of the cap 8, will have a muchgreater radiating surface than is possessed by pistons of ordinary type,and consequently it Will be capable of radiating a larger amount of heatthan conventional pistons.

Though We have shown and described herein a preferred embodiment of theinvention, it is to be definitely understood that we do not desire tolimit the application of the invention thereto, and any change orchanges may be made in material and structure and arrangement of parts,Within the spirit of the invention and the scope of the subjoinedclaims.

What is claimed is 1. A sectional casting or core box comprising asectional body portion, a. cap seatable upon the body portion, capengaging locking members carried by the body portion, and annular meansfor maintaining said locking means in cap engaging position and formaintaining the sections of the body portion together.

2. A sectional casting or core box comprising a sectional body portion,a cap seatable upon the body portion, cap engaging locking memberscarried by the body portion, and annular means for maintaining saidlocking means in cap engaging position and for maintaining the sectionsof the body portion together, said body portion being composed of aplurality of arcuate sections.

3. A sectional casting or core box comprising a sectional body portion,a cap seatable upon the body portion, cap engaging locking memberscarried by the body portion, and annular means for maintaining saidlocking means in cap engaging position and for maintaining the sectionsof the body portion together, said body portion being composed of aplurality of arcuate sections, the interior of some of said sectionsbeing provided with Wrist-pin forming projection means.

In testimony whereof we affix our signatures.

MYNARD L. HOLLOWAY. CLYDE STEPHENSON.

